The heterogeneous oxidation of n-hexane soot surfaces by gas-phase ozone has been studied in a coated-wall flow tube connected to a mass spectrometer. Uptake measurements confirm earlier studies that the initial uptake is primarily non-catalytic and that the number of reactive surface sites is close to that of a full monolayer. The initial uptake kinetics exhibit an inverse dependence on ozone gas-phase concentration, as expected if the reaction proceeds via a Langmuir-Hinshelwood mechanism. Support for this reaction not being an Eley-Rideal process comes from the lack of temperature dependence of the initial uptake coefficient, and that a saturated surface coverage of adsorbed dodecane does not affect the kinetics. It is demonstrated that there is a strong similarity between the initial uptake kinetics for ozone loss on a wide variety of surfaces. This suggests that the reactions proceed through a common rate determining step, most likely involving adsorbed ozone molecules.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:OTU.1807/17200 |
| Date | 24 February 2009 |
| Creators | McCabe, Jeffrey Joseph |
| Contributors | Abbatt, Jonathan P. D. |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
| Format | 1472970 bytes, application/pdf |
Page generated in 0.0011 seconds